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Inventories - Disclosure of Inventories (Detail) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Finished goods € 182 € 164
Work in progress 388 332
Raw materials 137 111
Stores and supplies 66 64
Adjustments (28) (28)
Total inventories € 745 € 643